what is difference between 635nm and 650nm wavelenght?

Hello.
I'll be buy laser diodes. But I don't know the laser wavelength difference between 635nm and 650nm. Please help me if known about this.

laser diodes with different laser wavelength label emits laser at different frequencies. You need to check with you application system whether the difference is tolerable or not.

I will use in shooting target project.
Am i use laser diodw with 650nm wavelenght in my project(electron shooting tarhet).
Please help me

What is the material of the target you are shooting at?
Can the material reponse similarly to laser with both wavelength?

gun bullet material is plumbum.

So I think red laser of both wave length should work for you

635 is percepted brighter than 650, may be an advantage for a visual laser.